ARX in the 13F filings

Accelerant Holdings · CUSIP G00894108

Sector · Insurance Theme · Financial services· L3VLUP-defined

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Quarter end: 30 Jun 2026; the date the book describes
Filed: 2 Sep 2026; latest of these filings; the earliest 3 Aug 2026
Managers listing it: 20; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q1 2026 and Q2 2026; 2 listed it in both
Shares listed: 17,061,750; combined, among listed positions
Reported value: $202m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 11 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +811,274.

Managers listing ARX in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

20 of 20 holders

				Action		Filing
Fidelity (FMR LLC)	5,628,679	$66m	under 0.1%	Added	+3,816,472	13 Aug 2026 (the filing on sec.gov)
Capital World Investors	4,626,664	$54m	under 0.1%	Trimmed	-526,077	12 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC	1,747,985	$20m	under 0.1%	Added	+603,779	2 Sep 2026 (the filing on sec.gov)
AllianceBernstein LP	1,447,153	$19m	under 0.1%	Trimmed	-1,353,035	14 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP	1,109,675	$13m	under 0.1%	Trimmed	-1,164,477	13 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC	952,066	$11m	under 0.1%	Added	+91,369	14 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC	541,257	$6.3m	under 0.1%	New	new	3 Aug 2026 (the filing on sec.gov)
Holocene Advisors LP	300,000	$3.5m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC	296,100	$3.5m	under 0.1%	Added	+19,500	13 Aug 2026 (the filing on sec.gov)
Tiger Global Management LLC	75,000	$879k	under 0.1%	Held	0	14 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP	69,019	$809k	under 0.1%	Trimmed	-639,027	14 Aug 2026 (the filing on sec.gov)
Woodline Partners LP	57,554	$675k	under 0.1%	Trimmed	-309,603	14 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	50,853	$596k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC	40,428	$474k	under 0.1%	Trimmed	-172,363	14 Aug 2026 (the filing on sec.gov)
Invesco Ltd	33,735	$395k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	23,500	$276k	under 0.1%	Held	0	14 Aug 2026 (the filing on sec.gov)
Winton Group Ltd	22,000	$258k	under 0.1%	Added	+8,200	7 Aug 2026 (the filing on sec.gov)
Millennium Management LLC	17,491	$205k	under 0.1%	Trimmed	-107,577	14 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP	11,512	$135k	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP	11,079	$130k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Fidelity (FMR LLC)existing position · 5,628,679 shares now+3,816,472
Citadel Advisors LLCexisting position · 1,747,985 shares now+603,779
Walleye Capital LLCnew position · 541,257 shares now+541,257
Holocene Advisors LPnew position · 300,000 shares now+300,000
Jane Street Group LLCexisting position · 952,066 shares now+91,369

Reductions

AllianceBernstein LPexisting position · 1,447,153 shares now-1,353,035
Marshall Wace LLPexisting position · 1,109,675 shares now-1,164,477
Susquehanna International Group LLPexisting position · 69,019 shares now-639,027
Capital World Investorsexisting position · 4,626,664 shares now-526,077
Woodline Partners LPexisting position · 57,554 shares now-309,603

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (5)

Point72 Asset Management LPwas $2.2m
Schonfeld Strategic Advisors LLCwas $1.5m
Hudson Bay Capital Management LPwas $738k
Brevan Howard Capital Management LPwas $727k
Man Group PLCwas $189k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

5 in Q3 2025 to 3 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ARX and V →ARX and AXP →ARX and BAC →Choose a stock to compare with ARX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ARX, latest filings →Back to the 13F Explorer →

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Quarter	Holders	Reported value	Buyers	Sellers
Q3 2025	5	$98m	5	0
Q4 2025	3	$140m	9	16
Q1 2026	2	$70m	14	9
Q2 2026	3	$59m	11	12